Save to spatialite empties 'width' column in some cases

[Jonasvsl]

reproduction is relatively easy:

Take this model: https://management.staging.3di.live/schematisations/442/5777 Load it in the schematisation editor. Save to spatialite upload and you'll get this: https://management.staging.3di.live/schematisations/442/5778

Maybe there are more difference but the cross section width is crucial for calculations

[leendertvanwolfswinkel]

Test sqlite: testing cross sections.zip

[ldebek]

@leendertvanwolfswinkel Fix available on the master branch.

[leendertvanwolfswinkel]

I had to set the schema version back to 209 to make it work, but it works now. I created a PR for schema version 210; we will bring schema version 210 to production soon, but not yet